How does PageSourceSearch know what socialcircle.com is built with?

From the site's own source code. The crawler stores the exact bytes of its pages and first-party scripts; the libraries are recognised by fingerprinting that code against known releases, the identifiers are read out of the tag snippets, and the third-party hosts are the script, iframe and stylesheet sources in the HTML and the absolute URLs inside the scripts. Nothing is inferred from headers or guessed.

How far back does the history of socialcircle.com go?

To the first crawl the timeline lists. Every crawl records what the site looked like; when a file's content changes, its earlier version stays viewable because the stored chunks are never deleted, only mapped. A crawl that finds a file unchanged adds no copy.

Can I see an older version of a script from socialcircle.com?

Yes. In the stored files list, every date under a file opens the version that was live at that crawl, with the same viewer as the current one. The raw bytes can be downloaded from there.

Which other websites use the same tracking IDs as socialcircle.com?

Each identifier links to its reverse lookup, the list of every site in the index whose source carries the same id: the sites one analytics property or tag manager container is shared across.

Site profile

socialcircle.com

Built with react 0.10.0, @clerk/ui 1.34.0, @blotoutio/providers-blotout-consent-sdk 1.73.0, @marimo-team/frontend 0.25.0, @inkeep/cxkit-js 0.5.119, @feathery/react 2.96.0, facebook-pixel, @sentry-internal/replay 10.57.0, spectorjs 0.9.33, vis-timeline 8.5.4, @moveo-ai/web-client 0.117.0, scanbot-web-sdk 9.0.0 and more. 2 pages and 124 stored files, last crawled 2026-10-09.

16 libraries 1 identifier 45 third-party hosts 1 crawl open the site

Technologies and libraries

Recognised by fingerprinting the stored files and bundles against known releases; a version is the release the bytes match.

Library	Version	Seen
react	0.10.0	2026-10-09
@clerk/ui	1.34.0	2026-10-09
@blotoutio/providers-blotout-consent-sdk	1.73.0	2026-10-09
@marimo-team/frontend	0.25.0	2026-10-09
@inkeep/cxkit-js	0.5.119	2026-10-09
@feathery/react	2.96.0	2026-10-09
facebook-pixel		2026-10-09
@sentry-internal/replay	10.57.0	2026-10-09
spectorjs	0.9.33	2026-10-09
vis-timeline	8.5.4	2026-10-09
@moveo-ai/web-client	0.117.0	2026-10-09
scanbot-web-sdk	9.0.0	2026-10-09
@ant-design/x	2.9.0	2026-10-09
@stytch/vanilla-js	6.3.0	2026-10-09
@joyfill/components	4.0.0-rc26	2026-10-09
@pydantic/ai-chat-ui	2.3.0	2026-10-09

Tracking, tag and verification IDs

Public identifiers read out of the source. Each links to every other site in the index that carries the same one.

What	Value	Found in
Sentry DSN host (Sentry)	o4508092495298560.ingest.us.sentry.io	view source

Third-party hosts

Hosts outside socialcircle.com that its pages load scripts, frames or stylesheets from, and that its own scripts name in absolute URLs (connect). Each links to every site loading from the same host.

Host	Loaded as	Found in
about.meta.com	connect	view source
about.x.com	connect	view source
adblitz.com	connect	view source
adblitz.localhost	connect	view source
api.adblitz.com	connect	view source
api.cloudinary.com	connect	view source
api.somatable.co	connect	view source
apps.apple.com	connect	view source
browser.sentry-cdn.com	connect	view source
commons.wikimedia.org	connect	view source
connect.facebook.net	connect	view source
developer.apple.com	connect	view source
docs.swmansion.com	connect	view source
example.com	connect	view source
facebook.com	connect	view source
github.com	connect	view source
help.ably.io	connect	view source
instagram.com	connect	view source
internet-up.ably-realtime.com	connect	view source
linkedin.com	connect	view source
merchantsignageeu.visa.com	connect	view source
o447951.ingest.sentry.io	connect	view source
partnermarketinghub.withgoogle.com	connect	view source
pay.google.com	connect	view source
platform.local	connect	view source
play.google.com	connect	view source
react.dev	connect	view source
res.cloudinary.com	connect	view source
sentry.io	connect	view source
soma.localhost	connect	view source
somatable.co	connect	view source
static.ads-twitter.com	connect	view source
tiktok.com	connect	view source
tlsocial.s3.amazonaws.com	connect	view source
us.i.posthog.com	connect	view source
va.vercel-scripts.com	connect	view source
vercel.live	connect	view source
www.apple.com	connect	view source
www.dinersclub.com	connect	view source
www.discovernetwork.com	connect	view source
www.global.jcb	connect	view source
www.mastercard.com	connect	view source
www.w3.org	connect	view source
www.youtube.com	connect	view source
youtube.com	connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 124) }. Versions are the crawls at which the file was new or its content changed; each opens the file as it was then, rebuilt from the same stored chunks.

File	Kind	Size	Collected	Versions
https://connect.facebook.net/en_US/fbevents.js	js library	not fetched	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/1m_zh0el77dz3.js	js	1.2 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2q-0l_jroxgly.js	js	1.2 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2ru0mnez7jgmi.js	js	638 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0pq0dj98i9q_t.js	js	894 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0eytmj8qzk_nw.js	js	833 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/3c6s8kd9v6kb2.js	js	894 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2su_dpk3u8tks.js	js	596 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2nqxmb6yd2364.js	js	493 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/3_v2n3rop57wc.js	js	493 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2_3lfrsal9bjs.js	js	486 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/1db-poxcjh0kg.js	js	559 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0y_o_l8mlf3cd.js	js	489 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/1v76y13rhjo6v.js	js	489 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2xhr49pblyyaj.js	js	609 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0oeggv49o77my.js	js	501 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2k1o_7_jtqcdh.js	js	488 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0612je56t4qro.js	js	905 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0lo4q8dns-ns1.js	js	1.2 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/3dl3h41gj1qem.js	js	597 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/08xuebifp0eqn.js	js	557 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/1ew6sag3er4sf.js	js	561 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/23lixeqmykz7a.js	js	716 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/38gq4x8ruioog.js	js	1009 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2n_02dl9r2f57.js	js	942 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2-azotnnn1c5p.js	js	926 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0e3-tkrm5vn0n.js	js	619 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/274km3sachatu.js	js	857 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0gunol02m2m2g.js	js	815 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/1mpiz7b8_9qy5.js	js	703 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/06wdouhc8c27x.js	js	711 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0j5fmkvqd129m.js	js	892 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2mce_ggmnmebf.js	js	719 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0ipnqm2ur0-24.js	js	1 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/09aq63cr_w94t.js	js	558 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/44jsjng5nvvq2.js	js	712 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/28hm5ugowy6dk.js	js	861 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0kqvtttpee4oi.js	js	494 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/16rn62i1eo2fi.js	js	610 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/17ej4o3alyr04.js	js	861 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/1yzevl4y0pa18.js	js	640 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/3fa5b3zen-pz9.js	js	639 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2zv8n2m6ie84c.js	js	1.2 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/3c2r33d6pr4k3.js	js	885 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/1zx2yu2yi0zf1.js	js	522 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/1aqu7mah_ehsv.js	js	1 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0p6q_n77pznz9.js	js	1.2 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/3gialxavyrcsn.js	js	594 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/3ji-vwckokqy3.js	js	1.1 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/22fr3hzqtyqlo.js	js	920 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2wc2mkmd838tl.js	js	1.2 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/3-ee4udv5yiff.js	js	565 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/04um1u96e-4-x.js	js	485 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2f5g93pbegkd1.js	js	491 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/3g0tjk_16ycv7.js	js	1.2 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/43i51hzyb2ifq.js	js	932 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/19pdur-rscglb.js	js	1.2 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2f6g5ht0zchqk.js	js	1.1 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/15_6bp61k1o4u.js	js	496 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2ozyg9yjvjezk.js	js	492 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0i7dedxw412p-.js	js	496 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2jzys6wmg4c_3.js	js	491 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2kj9tv31j91ty.js	js	704 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/3nkm9_nejst5q.js	js	1.2 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0vtvv4y-tnu7y.js	js	567 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/3ccpfrs9vgi--.js	js	557 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0-lra6u8d5n4z.js	js	875 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/30pdlibeyweih.js	js	755 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/36ilusclp5rxz.js	js	1.2 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/1w32slphm0yxs.js	js	885 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0h3zbe2pdo-gl.js	js	487 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0cg0685e_4ec1.js	js	380 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2zgpi1feb8h0-.js	js	930 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/3ap7w47n9sd90.js	js	915 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/build-TfctsWXpff2fKS/_ssgManifest.js	js	76 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/build-TfctsWXpff2fKS/_buildManifest.js	js	7.5 KB	2026-10-09	2026-10-09
https://socialcircle.com/_vercel/insights/script.js	js	4.4 KB	2026-10-09	2026-10-09
https://socialcircle.com/ab/ab.js	js	6.6 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/tur…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	11.4 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/395…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	88.3 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/3cs…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	348.5 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2_f…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	40.1 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0kd…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	26.7 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/build-Tfct…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	96 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/build-Tfct…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	76 B	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/build-Tfct…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	7.5 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/tur…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	11.7 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/38t…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	87.2 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0r-…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	60.2 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/1p3…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	348.5 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0e0…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	33.8 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/1te…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	29.2 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2t6…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	88.3 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0f5…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	56.4 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/3kd…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	24.3 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/tur…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	11.9 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2l6…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	348.5 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/1u2…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	171.2 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2xv…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	179.5 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/066…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	29.2 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/3e_…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	344.9 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0om…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	33.1 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/237…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	127.4 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/1mu…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	19.6 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/1s1…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	88.3 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/08l…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	260.6 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/03y…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	194.2 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/3xe…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	99.1 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/1wt…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	315.9 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/3_l…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	48.4 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/26e…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	44.8 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2mi…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	51 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0n_…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	32.6 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/1rg…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	101 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/10x…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	40.5 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/2c0…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	75.4 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0x9…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	39.2 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0_u…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	33.8 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/164…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	56.4 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/0j-…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	31.3 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/07d…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	21.5 KB	2026-10-09	2026-10-09
https://socialcircle.com/_next/static/chunks/3g-…pl_Ausbf3UTMax7nH6RvX7qmwEuVxMB	js	25.9 KB	2026-10-09	2026-10-09
https://socialcircle.com/	html	53.5 KB	2026-10-09	2026-10-09
https://socialcircle.com/host	html	46.2 KB	2026-10-09	2026-10-09

Timeline

One entry per crawl, newest first, with what changed since the crawl before: libraries, identifiers, third-party hosts and files. Historical versions stay viewable because the stored chunks are shared between versions, never copied.

2026-10-09 first crawl

2 pages, 124 files, 4.2 MB; 16 libraries, 1 identifier, 45 third-party hosts
16 libraries added
- @clerk/ui 1.34.0
- @feathery/react 2.96.0
- @pydantic/ai-chat-ui 2.3.0
- scanbot-web-sdk 9.0.0
- @stytch/vanilla-js 6.3.0
- @sentry-internal/replay 10.57.0
- @inkeep/cxkit-js 0.5.119
- spectorjs 0.9.33
- @moveo-ai/web-client 0.117.0
- @joyfill/components 4.0.0-rc26
- @ant-design/x 2.9.0
- vis-timeline 8.5.4
- and 4 more
1 identifier added
- o4508092495298560.ingest.us.sentry.io Sentry DSN host
45 third-party hosts added
- api.cloudinary.com
- res.cloudinary.com
- instagram.com
- facebook.com
- tiktok.com
- youtube.com
- linkedin.com
- soma.localhost
- us.i.posthog.com
- adblitz.localhost
- tlsocial.s3.amazonaws.com
- adblitz.com
- and 33 more
124 files added

Questions about socialcircle.com

How does PageSourceSearch know what socialcircle.com is built with?: From the site's own source code. The crawler stores the exact bytes of its pages and first-party scripts; the libraries are recognised by fingerprinting that code against known releases, the identifiers are read out of the tag snippets, and the third-party hosts are the script, iframe and stylesheet sources in the HTML and the absolute URLs inside the scripts. Nothing is inferred from headers or guessed.
How far back does the history of socialcircle.com go?: To the first crawl the timeline lists. Every crawl records what the site looked like; when a file's content changes, its earlier version stays viewable because the stored chunks are never deleted, only mapped. A crawl that finds a file unchanged adds no copy.
Can I see an older version of a script from socialcircle.com?: Yes. In the stored files list, every date under a file opens the version that was live at that crawl, with the same viewer as the current one. The raw bytes can be downloaded from there.
Which other websites use the same tracking IDs as socialcircle.com?: Each identifier links to its reverse lookup, the list of every site in the index whose source carries the same id: the sites one analytics property or tag manager container is shared across.

Look up another site, browse sites by tracking ID, third-party host or technology. Site owners: see the crawler page for how stored pages are removed.